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Home » Compare Lenses » Tamron SP AF 17-50mm F2.8 XR Di II LD Aspherical IF vs Pentax HD -DA 20-40mm F2.8-4 ED Limited DC WR

Tamron SP AF 17-50mm F2.8 XR Di II LD Aspherical IF vs Pentax HD -DA 20-40mm F2.8-4 ED Limited DC WR

Looking to find more information regarding these two camera lenses? Check out our side by side comparison of the Tamron SP AF 17-50mm F2.8 XR Di II LD Aspherical IF vs HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WRto review specs, pros and cons, and which is right for you.

Tamron 17-50mm f2.8 XR II LD Top Features

  • 17-50mm Focal Range
  • F2.8 Max Aperture
  • Filter Thread: 67mm
  • Max Format: APS-C / DX
  • Pentax KAF Mount
  • Weight: 430g.
  • Diameter: 74mm
  • Length: 82mm
  • Min Focus Distance:0.27m
  • Max Magnification:0.22x

Tamron SP AF 17-50mm F2.8 XR Di II LD Aspherical IF

Pentax DA 20-40mm F2.8-4 ED DC WR Top Features

  • 20-40mm Focal Range
  • F2.8 – F4.0 Max Aperture
  • Weather Sealed
  • Filter Thread: 55mm
  • Max Format:
  • Pentax KAF3 Mount
  • Weight: 283g.
  • Diameter: 71mm
  • Length: 69mm
  • Min Focus Distance:0.28m
  • Max Magnification:0.2x

HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR

Our Winner: Tamron SP AF 17-50mm F2.8 XR Di II LD Aspherical IF over HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR

Focal Length – Wide 17mm vs 20mm
Focal Length – Tele 50mm vs 40mm
Optical Zoom 2.90x vs 2.00x
Max Aperture – Tele 2.8 vs 4
Minimum Focus Distance 0.27m vs 0.28m
Max Magnification 0.22x vs 0.2x

Pros Of HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR over Tamron SP AF 17-50mm F2.8 XR Di II LD Aspherical IF
Diaphgragm Blades 9 vs 7
Weight 283g vs 430g
Diameter 71mm vs 74mm
Length 69mm vs 82mm
Filter Thread 55mm vs 67mm
Weather Sealing Yes vs No

Cons Of Tamron SP AF 17-50mm F2.8 XR Di II LD Aspherical IF and HD Pentax-DA 20-40mm F2.8-4 ED Limited DC WR
Image Stabilization No vs No
Internal Zoom No vs No

Tamron 17-50mm f2.8 XR II LD vs Pentax DA 20-40mm F2.8-4 ED DC WR All Features

General Tamron 17-50mm f2.8 XR II LD Pentax DA 20-40mm F2.8-4 ED DC WR
Brand Tamron Pentax
Lens Type Zoom Zoom
Price CHECK PRICE CHECK PRICE
Lens Type Standard Zoom Standard Zoom
Lens Mount Pentax KAF Pentax KAF3
Max Format APS-C / DX APS-C / DX
Focal Range 17-50mm 20-40mm
Image Stabilization No No
Colour Black Black, silver
Zoom Method Rotary (extending) Rotary (extending)
Power Zoom
Zoom Lock Yes
Zoom Ratio 2.9X 2.0X
Aperture
Max Aperture F2.8 F2.8 – F4.0
Min Aperture F32.0 F22.0 – F32.0
Aperture Ring No No
Diaphragm Blades 7 9
Optics
Optical Elements 16 9
Optical Groups 13 8
Special Elements 2 hybrid aspherical elements 1 LD (Low Dispersion) glass element 1 XR (Extra Refractive) element 1 ED glass element, 1 SLD glass element, HD coating
Focusing
Min Focus Distance 0.27m 0.28m
Max Magnification 0.22X 0.2X
Autofocus Yes Yes
AF Motor Type Micromotor Micromotor
Full Time Manual Yes
Focus Method Internal Unknown
Distance Scale Yes Yes
DoF Scale Yes Yes
Distance Scale Yes Yes
Focus Distance Limiter Unknown Unknown
Physical Specs
Weight 430g 283g
Diameter 74mm 71mm
Length 82mm 69mm
Materials Unknown Aluminium barrel
Weather Sealing Unknown Yes
Filter Thread 67mm 55mm
Filter Notes
Hood Supplied Yes Yes
Hood Code flower shaped hood MH-RA55
Tripod Collar No No
Optional Accessories
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